/******************************************************************************
 *									      *
 *				   N O T I C E				      *
 *									      *
 *		      Copyright Abandoned, 1987, Fred Fish		      *
 *									      *
 *									      *
 *	This previously copyrighted work has been placed into the  public     *
 *	domain	by  the  author  and  may be freely used for any purpose,     *
 *	private or commercial.						      *
 *									      *
 *	Because of the number of inquiries I was receiving about the  use     *
 *	of this product in commercially developed works I have decided to     *
 *	simply make it public domain to further its unrestricted use.	I     *
 *	specifically  would  be  most happy to see this material become a     *
 *	part of the standard Unix distributions by AT&T and the  Berkeley     *
 *	Computer  Science  Research Group, and a standard part of the GNU     *
 *	system from the Free Software Foundation.			      *
 *									      *
 *	I would appreciate it, as a courtesy, if this notice is  left  in     *
 *	all copies and derivative works.  Thank you.			      *
 *									      *
 *	The author makes no warranty of any kind  with	respect  to  this     *
 *      product  and  explicitly disclaims any implied warranties of mer-     *
 *	chantability or fitness for any particular purpose.		      *
 *									      *
 ******************************************************************************
 */

/*
 *  FILE
 *
 *	dbug.c	 runtime support routines for dbug package
 *
 *  SCCS
 *
 *	@(#)dbug.c	1.25	7/25/89
 *
 *  DESCRIPTION
 *
 *	These are the runtime support routines for the dbug package.
 *	The dbug package has two main components; the user include
 *	file containing various macro definitions, and the runtime
 *	support routines which are called from the macro expansions.
 *
 *	Externally visible functions in the runtime support module
 *	use the naming convention pattern "_db_xx...xx_", thus
 *	they are unlikely to collide with user defined function names.
 *
 *  AUTHOR(S)
 *
 *	Fred Fish		(base code)
 *	Enhanced Software Technologies, Tempe, AZ
 *	asuvax!mcdphx!estinc!fnf
 *
 *	Binayak Banerjee	(profiling enhancements)
 *	seismo!bpa!sjuvax!bbanerje
 *
 *	Michael Widenius:
 *	DBUG_DUMP	- To dump a block of memory.
 *      PUSH_FLAG "O"   - To be used insted of "o" if we
 *                        want flushing after each write
 *	PUSH_FLAG "A"	- as 'O', but we will append to the out file instead
 *			  of creating a new one.
 *	Check of malloc on entry/exit (option "S")
 */

#ifdef DBUG_OFF
#undef DBUG_OFF
#endif
#include <my_global.h>
#include <m_string.h>
#include <errno.h>
#if defined(MSDOS) || defined(__WIN__)
#include <process.h>
#endif

#ifdef _DBUG_CONDITION_
#define _DBUG_START_CONDITION_ "d:t"
#else
#define _DBUG_START_CONDITION_ ""
#endif

/*
 *	      Manifest constants that should not require any changes.
 */

#define EOS '\000' /* End Of String marker */

/*
 *	      Manifest constants which may be "tuned" if desired.
 */

#define PRINTBUF 1024 /* Print buffer size */
#define INDENT 2      /* Indentation per trace level */
#define MAXDEPTH 200  /* Maximum trace depth default */

/*
 *	The following flags are used to determine which
 *	capabilities the user has enabled with the state
 *	push macro.
 */

#define TRACE_ON 000001        /* Trace enabled */
#define DEBUG_ON 000002        /* Debug enabled */
#define FILE_ON 000004         /* File name print enabled */
#define LINE_ON 000010         /* Line number print enabled */
#define DEPTH_ON 000020        /* Function nest level print enabled */
#define PROCESS_ON 000040      /* Process name print enabled */
#define NUMBER_ON 000100       /* Number each line of output */
#define PROFILE_ON 000200      /* Print out profiling code */
#define PID_ON 000400          /* Identify each line with process id */
#define SANITY_CHECK_ON 001000 /* Check safemalloc on DBUG_ENTER */
#define FLUSH_ON_WRITE 002000  /* Flush on every write */

#define TRACING (stack->flags & TRACE_ON)
#define DEBUGGING (stack->flags & DEBUG_ON)
#define PROFILING (stack->flags & PROFILE_ON)
#define STREQ(a, b) (strcmp(a, b) == 0)

/*
 *	Typedefs to make things more obvious.
 */

#ifndef __WIN__
typedef int BOOLEAN;
#else
#define BOOLEAN BOOL
#endif

/*
 *	Make it easy to change storage classes if necessary.
 */

#define IMPORT extern     /* Names defined externally */
#define EXPORT            /* Allocated here, available globally */
#define AUTO auto         /* Names to be allocated on stack */
#define REGISTER register /* Names to be placed in registers */

/*
 * The default file for profiling.  Could also add another flag
 * (G?) which allowed the user to specify this.
 *
 * If the automatic variables get allocated on the stack in
 * reverse order from their declarations, then define AUTOS_REVERSE.
 * This is used by the code that keeps track of stack usage.  For
 * forward allocation, the difference in the dbug frame pointers
 * represents stack used by the callee function.  For reverse allocation,
 * the difference represents stack used by the caller function.
 *
 */

#define PROF_FILE "dbugmon.out"
#define PROF_EFMT "E\t%ld\t%s\n"
#define PROF_SFMT "S\t%lx\t%lx\t%s\n"
#define PROF_XFMT "X\t%ld\t%s\n"

#ifdef M_I386 /* predefined by xenix 386 compiler */
#define AUTOS_REVERSE 1
#endif

/*
 *	Variables which are available externally but should only
 *	be accessed via the macro package facilities.
 */

EXPORT FILE *_db_fp_ = (FILE *)0;           /* Output stream, default stderr */
EXPORT char *_db_process_ = (char *)"dbug"; /* Pointer to process name; argv[0] */
EXPORT FILE *_db_pfp_ = (FILE *)0;          /* Profile stream, 'dbugmon.out' */
EXPORT BOOLEAN _db_on_ = FALSE;             /* TRUE if debugging currently on */
EXPORT BOOLEAN _db_pon_ = FALSE;            /* TRUE if profile currently on */
EXPORT BOOLEAN _no_db_ = FALSE;             /* TRUE if no debugging at all */

/*
 *	Externally supplied functions.
 */

#ifndef HAVE_PERROR
static void perror(); /* Fake system/library error print routine */
#endif

IMPORT int _sanity(const char *file, uint line);

/*
 *	The user may specify a list of functions to trace or
 *	debug.	These lists are kept in a linear linked list,
 *	a very simple implementation.
 */

struct link
{
  char *str;              /* Pointer to link's contents */
  struct link *next_link; /* Pointer to the next link */
};

/*
 *	Debugging states can be pushed or popped off of a
 *	stack which is implemented as a linked list.  Note
 *	that the head of the list is the current state and the
 *	stack is pushed by adding a new state to the head of the
 *	list or popped by removing the first link.
 */

struct state
{
  int flags;                /* Current state flags */
  int maxdepth;             /* Current maximum trace depth */
  uint delay;               /* Delay after each output line */
  int sub_level;            /* Sub this from code_state->level */
  FILE *out_file;           /* Current output stream */
  FILE *prof_file;          /* Current profiling stream */
  char name[FN_REFLEN];     /* Name of output file */
  struct link *functions;   /* List of functions */
  struct link *p_functions; /* List of profiled functions */
  struct link *keywords;    /* List of debug keywords */
  struct link *processes;   /* List of process names */
  struct state *next_state; /* Next state in the list */
};

/*
 *	Local variables not seen by user.
 */

static my_bool init_done = FALSE; /* Set to TRUE when initialization done */
static struct state *stack = 0;

typedef struct st_code_state
{
  const char *func;    /* Name of current user function */
  const char *file;    /* Name of current user file */
  char **framep;       /* Pointer to current frame */
  const char *jmpfunc; /* Remember current function for setjmp */
  const char *jmpfile; /* Remember current file for setjmp */
  int lineno;          /* Current debugger output line number */
  int level;           /* Current function nesting level */
  int disable_output;  /* Set to it if output is disabled */
  int jmplevel;        /* Remember nesting level at setjmp () */

  /*
   *	The following variables are used to hold the state information
   *	between the call to _db_pargs_() and _db_doprnt_(), during
   *	expansion of the DBUG_PRINT macro.  This is the only macro
   *	that currently uses these variables.
   *
   *	These variables are currently used only by _db_pargs_() and
   *	_db_doprnt_().
   */

  uint u_line;           /* User source code line number */
  int locked;            /* If locked with _db_lock_file */
  const char *u_keyword; /* Keyword for current macro */
} CODE_STATE;

/* Parse a debug command string */
static struct link *ListParse(char *ctlp);
/* Make a fresh copy of a string */
static char *StrDup(const char *str);
/* Open debug output stream */
static void DBUGOpenFile(const char *name, int append);
#ifndef THREAD
/* Open profile output stream */
static FILE *OpenProfile(const char *name);
/* Profile if asked for it */
static BOOLEAN DoProfile(void);
#endif
/* Return current user time (ms) */
#ifndef THREAD
static unsigned long Clock(void);
#endif
/* Close debug output stream */
static void CloseFile(FILE *fp);
/* Push current debug state */
static void PushState(void);
/* Test for tracing enabled */
static BOOLEAN DoTrace(CODE_STATE *state);
/* Test to see if file is writable */
#if !(!defined(HAVE_ACCESS) || defined(MSDOS))
static BOOLEAN Writable(char *pathname);
/* Change file owner and group */
static void ChangeOwner(char *pathname);
/* Allocate memory for runtime support */
#endif
static char *DbugMalloc(size_t size);
/* Remove leading pathname components */
static char *BaseName(const char *pathname);
static void DoPrefix(uint line);
static void FreeList(struct link *linkp);
static void Indent(int indent);
static BOOLEAN InList(struct link *linkp, const char *cp);
static void dbug_flush(CODE_STATE *);
static void DbugExit(const char *why);
static int DelayArg(int value);
/* Supplied in Sys V runtime environ */
/* Break string into tokens */
static char *static_strtok(char *s1, pchar chr);

/*
 *	Miscellaneous printf format strings.
 */

#define ERR_MISSING_RETURN "%s: missing DBUG_RETURN or DBUG_VOID_RETURN macro in function \"%s\"\n"
#define ERR_OPEN "%s: can't open debug output stream \"%s\": "
#define ERR_CLOSE "%s: can't close debug file: "
#define ERR_ABORT "%s: debugger aborting because %s\n"
#define ERR_CHOWN "%s: can't change owner/group of \"%s\": "

/*
 *	Macros and defines for testing file accessibility under UNIX and MSDOS.
 */

#undef EXISTS
#if !defined(HAVE_ACCESS) || defined(MSDOS)
#define EXISTS(pathname) (FALSE) /* Assume no existance */
#define Writable(name) (TRUE)
#else
#define EXISTS(pathname) (access(pathname, F_OK) == 0)
#define WRITABLE(pathname) (access(pathname, W_OK) == 0)
#endif
#ifndef MSDOS
#define ChangeOwner(name)
#endif

/*
 *	Translate some calls among different systems.
 */

#if defined(unix) || defined(xenix) || defined(VMS) || defined(__NetBSD__)
#define Delay(A) sleep((uint)A)
#elif defined(AMIGA)
IMPORT int Delay(); /* Pause for given number of ticks */
#else
static int Delay(int ticks);
#endif

/*
** Macros to allow dbugging with threads
*/

#ifdef THREAD
#include <my_pthread.h>
pthread_mutex_t THR_LOCK_dbug;

static void init_dbug_state(void) { pthread_mutex_init(&THR_LOCK_dbug, MY_MUTEX_INIT_FAST); }

static CODE_STATE *code_state(void)
{
  CODE_STATE *state = 0;
  struct st_my_thread_var *tmp = my_thread_var;
  if (tmp)
  {
    if (!(state = (CODE_STATE *)tmp->dbug))
    {
      state = (CODE_STATE *)DbugMalloc(sizeof(*state));
      bzero((char *)state, sizeof(*state));
      state->func = "?func";
      state->file = "?file";
      tmp->dbug = (gptr)state;
    }
  }
  return state;
}

#else /* !THREAD */

#define init_dbug_state()
#define code_state() (&static_code_state)
#define pthread_mutex_lock(A) \
  {                           \
  }
#define pthread_mutex_unlock(A) \
  {                             \
  }
static CODE_STATE static_code_state = {"?func", "?file", NULL, NullS, NullS, 0, 0, 0, 0, 0, 0, NullS};
#endif

/*
 *  FUNCTION
 *
 *	_db_push_	push current debugger state and set up new one
 *
 *  SYNOPSIS
 *
 *	VOID _db_push_ (control)
 *	char *control;
 *
 *  DESCRIPTION
 *
 *	Given pointer to a debug control string in "control", pushes
 *	the current debug state, parses the control string, and sets
 *	up a new debug state.
 *
 *	The only attribute of the new state inherited from the previous
 *	state is the current function nesting level.  This can be
 *	overridden by using the "r" flag in the control string.
 *
 *	The debug control string is a sequence of colon separated fields
 *	as follows:
 *
 *		<field_1>:<field_2>:...:<field_N>
 *
 *	Each field consists of a mandatory flag character followed by
 *	an optional "," and comma separated list of modifiers:
 *
 *		flag[,modifier,modifier,...,modifier]
 *
 *	The currently recognized flag characters are:
 *
 *		d	Enable output from DBUG_<N> macros for
 *			for the current state.	May be followed
 *			by a list of keywords which selects output
 *			only for the DBUG macros with that keyword.
 *			A null list of keywords implies output for
 *			all macros.
 *
 *		D	Delay after each debugger output line.
 *			The argument is the number of tenths of seconds
 *			to delay, subject to machine capabilities.
 *			I.E.  -#D,20 is delay two seconds.
 *
 *		f	Limit debugging and/or tracing, and profiling to the
 *			list of named functions.  Note that a null list will
 *			disable all functions.	The appropriate "d" or "t"
 *			flags must still be given, this flag only limits their
 *			actions if they are enabled.
 *
 *		F	Identify the source file name for each
 *			line of debug or trace output.
 *
 *		i	Identify the process with the pid for each line of
 *			debug or trace output.
 *
 *		g	Enable profiling.  Create a file called 'dbugmon.out'
 *			containing information that can be used to profile
 *			the program.  May be followed by a list of keywords
 *			that select profiling only for the functions in that
 *			list.  A null list implies that all functions are
 *			considered.
 *
 *		L	Identify the source file line number for
 *			each line of debug or trace output.
 *
 *		n	Print the current function nesting depth for
 *			each line of debug or trace output.
 *
 *		N	Number each line of dbug output.
 *
 *		o	Redirect the debugger output stream to the
 *			specified file.  The default output is stderr.
 *
 *		O	As O but the file is really flushed between each
 *			write. When neaded the file is closed and reopened
 *			between each write.
 *
 *		p	Limit debugger actions to specified processes.
 *			A process must be identified with the
 *			DBUG_PROCESS macro and match one in the list
 *			for debugger actions to occur.
 *
 *		P	Print the current process name for each
 *			line of debug or trace output.
 *
 *		r	When pushing a new state, do not inherit
 *			the previous state's function nesting level.
 *			Useful when the output is to start at the
 *			left margin.
 *
 *		S	Do function _sanity(_file_,_line_) at each
 *			debugged function until _sanity() returns
 *			something that differs from 0.
 *			(Moustly used with safemalloc)
 *
 *		t	Enable function call/exit trace lines.
 *			May be followed by a list (containing only
 *			one modifier) giving a numeric maximum
 *			trace level, beyond which no output will
 *			occur for either debugging or tracing
 *			macros.  The default is a compile time
 *			option.
 *
 *	Some examples of debug control strings which might appear
 *	on a shell command line (the "-#" is typically used to
 *	introduce a control string to an application program) are:
 *
 *		-#d:t
 *		-#d:f,main,subr1:F:L:t,20
 *		-#d,input,output,files:n
 *
 *	For convenience, any leading "-#" is stripped off.
 *
 */

void _db_push_(const char *control)
{
  reg1 char *scan;
  reg2 struct link *temp;
  CODE_STATE *state;
  char *new_str;

  if (!_db_fp_)
    _db_fp_ = stderr; /* Output stream, default stderr */

  if (*control == '-')
  {
    if (*++control == '#')
      control++;
  }
  if (*control)
    _no_db_ = 0; /* We are using dbug after all */

  new_str = StrDup(control);
  PushState();
  state = code_state();

  scan = static_strtok(new_str, ':');
  for (; scan != NULL; scan = static_strtok((char *)NULL, ':'))
  {
    switch (*scan++)
    {
      case 'd':
        _db_on_ = TRUE;
        stack->flags |= DEBUG_ON;
        if (*scan++ == ',')
        {
          stack->keywords = ListParse(scan);
        }
        break;
      case 'D':
        stack->delay = 0;
        if (*scan++ == ',')
        {
          temp = ListParse(scan);
          stack->delay = DelayArg(atoi(temp->str));
          FreeList(temp);
        }
        break;
      case 'f':
        if (*scan++ == ',')
        {
          stack->functions = ListParse(scan);
        }
        break;
      case 'F':
        stack->flags |= FILE_ON;
        break;
      case 'i':
        stack->flags |= PID_ON;
        break;
#ifndef THREAD
      case 'g':
        _db_pon_ = TRUE;
        if (OpenProfile(PROF_FILE))
        {
          stack->flags |= PROFILE_ON;
          if (*scan++ == ',')
            stack->p_functions = ListParse(scan);
        }
        break;
#endif
      case 'L':
        stack->flags |= LINE_ON;
        break;
      case 'n':
        stack->flags |= DEPTH_ON;
        break;
      case 'N':
        stack->flags |= NUMBER_ON;
        break;
      case 'A':
      case 'O':
        stack->flags |= FLUSH_ON_WRITE;
      case 'a':
      case 'o':
        if (*scan++ == ',')
        {
          temp = ListParse(scan);
          DBUGOpenFile(temp->str, (int)(scan[-2] == 'A' || scan[-2] == 'a'));
          FreeList(temp);
        }
        else
        {
          DBUGOpenFile("-", 0);
        }
        break;
      case 'p':
        if (*scan++ == ',')
        {
          stack->processes = ListParse(scan);
        }
        break;
      case 'P':
        stack->flags |= PROCESS_ON;
        break;
      case 'r':
        stack->sub_level = state->level;
        break;
      case 't':
        stack->flags |= TRACE_ON;
        if (*scan++ == ',')
        {
          temp = ListParse(scan);
          stack->maxdepth = atoi(temp->str);
          FreeList(temp);
        }
        break;
      case 'S':
        stack->flags |= SANITY_CHECK_ON;
        break;
    }
  }
  free(new_str);
}

/*
 *  FUNCTION
 *
 *	_db_pop_    pop the debug stack
 *
 *  DESCRIPTION
 *
 *	Pops the debug stack, returning the debug state to its
 *	condition prior to the most recent _db_push_ invocation.
 *	Note that the pop will fail if it would remove the last
 *	valid state from the stack.  This prevents user errors
 *	in the push/pop sequence from screwing up the debugger.
 *	Maybe there should be some kind of warning printed if the
 *	user tries to pop too many states.
 *
 */

void _db_pop_()
{
  reg1 struct state *discard;
  discard = stack;
  if (discard != NULL && discard->next_state != NULL)
  {
    stack = discard->next_state;
    _db_fp_ = stack->out_file;
    _db_pfp_ = stack->prof_file;
    if (discard->keywords != NULL)
    {
      FreeList(discard->keywords);
    }
    if (discard->functions != NULL)
    {
      FreeList(discard->functions);
    }
    if (discard->processes != NULL)
    {
      FreeList(discard->processes);
    }
    if (discard->p_functions != NULL)
    {
      FreeList(discard->p_functions);
    }
    CloseFile(discard->out_file);
    if (discard->prof_file)
      CloseFile(discard->prof_file);
    free((char *)discard);
    if (!(stack->flags & DEBUG_ON))
      _db_on_ = 0;
  }
  else
  {
    _db_on_ = 0;
  }
}

/*
 *  FUNCTION
 *
 *	_db_enter_    process entry point to user function
 *
 *  SYNOPSIS
 *
 *	VOID _db_enter_ (_func_, _file_, _line_,
 *			 _sfunc_, _sfile_, _slevel_, _sframep_)
 *	char *_func_;		points to current function name
 *	char *_file_;		points to current file name
 *	int _line_;		called from source line number
 *	char **_sfunc_;		save previous _func_
 *	char **_sfile_;		save previous _file_
 *	int *_slevel_;		save previous nesting level
 *	char ***_sframep_;	save previous frame pointer
 *
 *  DESCRIPTION
 *
 *	Called at the beginning of each user function to tell
 *	the debugger that a new function has been entered.
 *	Note that the pointers to the previous user function
 *	name and previous user file name are stored on the
 *	caller's stack (this is why the ENTER macro must be
 *	the first "executable" code in a function, since it
 *	allocates these storage locations).  The previous nesting
 *	level is also stored on the callers stack for internal
 *	self consistency checks.
 *
 *	Also prints a trace line if tracing is enabled and
 *	increments the current function nesting depth.
 *
 *	Note that this mechanism allows the debugger to know
 *	what the current user function is at all times, without
 *	maintaining an internal stack for the function names.
 *
 */

void _db_enter_(const char *_func_, const char *_file_, uint _line_, const char **_sfunc_, const char **_sfile_,
                uint *_slevel_, char ***_sframep_ __attribute__((unused)))
{
  reg1 CODE_STATE *state;

	// TODO:
	// _no_db_ = 0;
	// _db_on_ = 1;

  if (!_no_db_)
  {
    int save_errno = errno;
    /*
      Sasha: the test below is so we could call functions with DBUG_ENTER
      before my_thread_init(). I needed this because I suspected corruption
      of a block allocated by my_thread_init() itself, so I wanted to use
      my_malloc()/my_free() in my_thread_init()/my_thread_end()
    */
    if (!(state = code_state()))
      return;
    if (!init_done)
      _db_push_(_DBUG_START_CONDITION_);

    *_sfunc_ = state->func;
    *_sfile_ = state->file;
    state->func = (char *)_func_;
    state->file = (char *)_file_; /* BaseName takes time !! */
    state->lineno = (int)_line_;  /* BaseName takes time !! */
    *_slevel_ = ++state->level;
#ifndef THREAD
    *_sframep_ = state->framep;
    state->framep = (char **)_sframep_;
    if (DoProfile())
    {
      long stackused;
      if (*state->framep == NULL)
      {
        stackused = 0;
      }
      else
      {
        stackused = ((long)(*state->framep)) - ((long)(state->framep));
        stackused = stackused > 0 ? stackused : -stackused;
      }
      (void)fprintf(_db_pfp_, PROF_EFMT, Clock(), state->func);
#ifdef AUTOS_REVERSE
      (void)fprintf(_db_pfp_, PROF_SFMT, state->framep, stackused, *_sfunc_);
#else
      (void)fprintf(_db_pfp_, PROF_SFMT, (ulong)state->framep, stackused, state->func);
#endif
      (void)fflush(_db_pfp_);
    }
#endif
    if (DoTrace(state))
    {
      if (!state->locked)
        pthread_mutex_lock(&THR_LOCK_dbug);
      DoPrefix(_line_);
      Indent(state->level);
      (void)fprintf(_db_fp_, ">%s [%s:%d]\n", state->func, state->file, state->lineno);
      dbug_flush(state); /* This does a unlock */
    }
#ifdef SAFEMALLOC
    if (stack->flags & SANITY_CHECK_ON && !state->disable_output)
      if (_sanity(_file_, _line_)) /* Check of safemalloc */
        stack->flags &= ~SANITY_CHECK_ON;
#endif
    errno = save_errno;
  }
}

/*
 *  FUNCTION
 *
 *	_db_return_    process exit from user function
 *
 *  SYNOPSIS
 *
 *	VOID _db_return_ (_line_, _sfunc_, _sfile_, _slevel_)
 *	int _line_;		current source line number
 *	char **_sfunc_;		where previous _func_ is to be retrieved
 *	char **_sfile_;		where previous _file_ is to be retrieved
 *	int *_slevel_;		where previous level was stashed
 *
 *  DESCRIPTION
 *
 *	Called just before user function executes an explicit or implicit
 *	return.  Prints a trace line if trace is enabled, decrements
 *	the current nesting level, and restores the current function and
 *	file names from the defunct function's stack.
 *
 */

void _db_return_(uint _line_, const char **_sfunc_, const char **_sfile_, uint *_slevel_)
{
  CODE_STATE *state;

  if (!_no_db_)
  {
    int save_errno = errno;
    if (!(state = code_state()))
      return;
    if (!init_done)
      _db_push_("");
    if (stack->flags & (TRACE_ON | DEBUG_ON | PROFILE_ON))
    {
      if (!state->locked)
        pthread_mutex_lock(&THR_LOCK_dbug);
      if (state->level != (int)*_slevel_)
        (void)fprintf(_db_fp_, ERR_MISSING_RETURN, _db_process_, state->func);
      else
      {
#ifdef SAFEMALLOC
        if (stack->flags & SANITY_CHECK_ON && !state->disable_output)
        {
          if (_sanity(*_sfile_, _line_))
            stack->flags &= ~SANITY_CHECK_ON;
        }
#endif
#ifndef THREAD
        if (DoProfile())
          (void)fprintf(_db_pfp_, PROF_XFMT, Clock(), state->func);
#endif
        if (DoTrace(state))
        {
          DoPrefix(_line_);
          Indent(state->level);
          (void)fprintf(_db_fp_, "<%s\n", state->func);
        }
      }
      dbug_flush(state);
    }
    state->level = *_slevel_ - 1;
    state->func = *_sfunc_;
    state->file = *_sfile_;
#ifndef THREAD
    if (state->framep != NULL)
      state->framep = (char **)*state->framep;
#endif
    errno = save_errno;
  }
}

/*
 *  FUNCTION
 *
 *	_db_pargs_    log arguments for subsequent use by _db_doprnt_()
 *
 *  SYNOPSIS
 *
 *	VOID _db_pargs_ (_line_, keyword)
 *	int _line_;
 *	char *keyword;
 *
 *  DESCRIPTION
 *
 *	The new universal printing macro DBUG_PRINT, which replaces
 *	all forms of the DBUG_N macros, needs two calls to runtime
 *	support routines.  The first, this function, remembers arguments
 *	that are used by the subsequent call to _db_doprnt_().
 *
 */

void _db_pargs_(uint _line_, const char *keyword)
{
  CODE_STATE *state = code_state();
  /* Sasha: pre-my_thread_init() safety */
  if (!state)
    return;
  state->u_line = _line_;
  state->u_keyword = (char *)keyword;
}

/*
 *  FUNCTION
 *
 *	_db_doprnt_    handle print of debug lines
 *
 *  SYNOPSIS
 *
 *	VOID _db_doprnt_ (format, va_alist)
 *	char *format;
 *	va_dcl;
 *
 *  DESCRIPTION
 *
 *	When invoked via one of the DBUG macros, tests the current keyword
 *	set by calling _db_pargs_() to see if that macro has been selected
 *	for processing via the debugger control string, and if so, handles
 *	printing of the arguments via the format string.  The line number
 *	of the DBUG macro in the source is found in u_line.
 *
 *	Note that the format string SHOULD NOT include a terminating
 *	newline, this is supplied automatically.
 *
 */

#include <stdarg.h>

void _db_doprnt_(const char *format, ...)
{
  va_list args;
  CODE_STATE *state;
  /* Sasha: pre-my_thread_init() safety */
  if (!(state = code_state()))
    return;

  va_start(args, format);

  if (_db_keyword_(state->u_keyword))
  {
    int save_errno = errno;
    if (!state->locked)
      pthread_mutex_lock(&THR_LOCK_dbug);
    DoPrefix(state->u_line);
    if (TRACING)
    {
      Indent(state->level + 1);
    }
    else
    {
      (void)fprintf(_db_fp_, "%s: ", state->func);
    }
    (void)fprintf(_db_fp_, "%s: ", state->u_keyword);
    (void)vfprintf(_db_fp_, format, args);
    (void)fputc('\n', _db_fp_);
    dbug_flush(state);
    errno = save_errno;
  }
  va_end(args);
}

/*
 *  FUNCTION
 *
 *            _db_dump_    dump a string in hex
 *
 *  SYNOPSIS
 *
 *	      void _db_dump_ (_line_,keyword,memory,length)
 *	      int _line_;		current source line number
 *	      char *keyword;
 *	      char *memory;		Memory to print
 *	      int length;		Bytes to print
 *
 *  DESCRIPTION
 *  Dump N characters in a binary array.
 *  Is used to examine corrputed memory or arrays.
 */

void _db_dump_(uint _line_, const char *keyword, const char *memory, uint length)
{
  int pos;
  char dbuff[90];
  CODE_STATE *state;
  if (!(state = code_state()))
    return;

  if (_db_keyword_((char *)keyword))
  {
    if (!state->locked)
      pthread_mutex_lock(&THR_LOCK_dbug);
    DoPrefix(_line_);
    if (TRACING)
    {
      Indent(state->level + 1);
      pos = min(max(state->level - stack->sub_level, 0) * INDENT, 80);
    }
    else
    {
      fprintf(_db_fp_, "%s: ", state->func);
    }
    sprintf(dbuff, "%s: Memory: 0x%lx  Bytes: (%d)\n", keyword, (ulong)memory, length);
    (void)fputs(dbuff, _db_fp_);

    pos = 0;
    while (length-- > 0)
    {
      uint tmp = *((unsigned char *)memory++);
      if ((pos += 3) >= 80)
      {
        fputc('\n', _db_fp_);
        pos = 3;
      }
      fputc(_dig_vec_upper[((tmp >> 4) & 15)], _db_fp_);
      fputc(_dig_vec_upper[tmp & 15], _db_fp_);
      fputc(' ', _db_fp_);
    }
    (void)fputc('\n', _db_fp_);
    dbug_flush(state);
  }
}

/*
  Enable/Disable output for this thread

  SYNOPSIS
    _db_output_()
    flag		1 = enable output, 0 = disable_output

*/

void _db_output_(uint flag)
{
  CODE_STATE *state;
  if (!(state = code_state()))
    return;
  state->disable_output = !flag;
}

/*
 *  FUNCTION
 *
 *	ListParse    parse list of modifiers in debug control string
 *
 *  SYNOPSIS
 *
 *	static struct link *ListParse (ctlp)
 *	char *ctlp;
 *
 *  DESCRIPTION
 *
 *	Given pointer to a comma separated list of strings in "cltp",
 *	parses the list, building a list and returning a pointer to it.
 *	The original comma separated list is destroyed in the process of
 *	building the linked list, thus it had better be a duplicate
 *	if it is important.
 *
 *	Note that since each link is added at the head of the list,
 *	the final list will be in "reverse order", which is not
 *	significant for our usage here.
 *
 */

static struct link *ListParse(char *ctlp)
{
  REGISTER char *start;
  REGISTER struct link *new_malloc;
  REGISTER struct link *head;

  head = NULL;
  while (*ctlp != EOS)
  {
    start = ctlp;
    while (*ctlp != EOS && *ctlp != ',')
    {
      ctlp++;
    }
    if (*ctlp == ',')
    {
      *ctlp++ = EOS;
    }
    new_malloc = (struct link *)DbugMalloc(sizeof(struct link));
    new_malloc->str = StrDup(start);
    new_malloc->next_link = head;
    head = new_malloc;
  }
  return (head);
}

/*
 *  FUNCTION
 *
 *	InList	  test a given string for member of a given list
 *
 *  SYNOPSIS
 *
 *	static BOOLEAN InList (linkp, cp)
 *	struct link *linkp;
 *	char *cp;
 *
 *  DESCRIPTION
 *
 *	Tests the string pointed to by "cp" to determine if it is in
 *	the list pointed to by "linkp".  Linkp points to the first
 *	link in the list.  If linkp is NULL then the string is treated
 *	as if it is in the list (I.E all strings are in the null list).
 *	This may seem rather strange at first but leads to the desired
 *	operation if no list is given.	The net effect is that all
 *	strings will be accepted when there is no list, and when there
 *	is a list, only those strings in the list will be accepted.
 *
 */

static BOOLEAN InList(struct link *linkp, const char *cp)
{
  REGISTER struct link *scan;
  REGISTER BOOLEAN result;

  if (linkp == NULL)
  {
    result = TRUE;
  }
  else
  {
    result = FALSE;
    for (scan = linkp; scan != NULL; scan = scan->next_link)
    {
      if (STREQ(scan->str, cp))
      {
        result = TRUE;
        break;
      }
    }
  }
  return (result);
}

/*
 *  FUNCTION
 *
 *	PushState    push current state onto stack and set up new one
 *
 *  SYNOPSIS
 *
 *	static VOID PushState ()
 *
 *  DESCRIPTION
 *
 *	Pushes the current state on the state stack, and initializes
 *	a new state.  The only parameter inherited from the previous
 *	state is the function nesting level.  This action can be
 *	inhibited if desired, via the "r" flag.
 *
 *	The state stack is a linked list of states, with the new
 *	state added at the head.  This allows the stack to grow
 *	to the limits of memory if necessary.
 *
 */

static void PushState()
{
  REGISTER struct state *new_malloc;

  if (!init_done)
  {
    init_dbug_state();
    init_done = TRUE;
  }
  (void)code_state(); /* Alloc memory */
  new_malloc = (struct state *)DbugMalloc(sizeof(struct state));
  new_malloc->flags = 0;
  new_malloc->delay = 0;
  new_malloc->maxdepth = MAXDEPTH;
  new_malloc->sub_level = 0;
  new_malloc->out_file = stderr;
  new_malloc->prof_file = (FILE *)0;
  new_malloc->functions = NULL;
  new_malloc->p_functions = NULL;
  new_malloc->keywords = NULL;
  new_malloc->processes = NULL;
  new_malloc->next_state = stack;
  stack = new_malloc;
}

/*
 *  FUNCTION
 *
 *	DoTrace    check to see if tracing is current enabled
 *
 *  SYNOPSIS
 *
 *	static BOOLEAN DoTrace (stack)
 *
 *  DESCRIPTION
 *
 *	Checks to see if tracing is enabled based on whether the
 *	user has specified tracing, the maximum trace depth has
 *	not yet been reached, the current function is selected,
 *	and the current process is selected.  Returns TRUE if
 *	tracing is enabled, FALSE otherwise.
 *
 */

static BOOLEAN DoTrace(CODE_STATE *state)
{
  // TODO:
  return FALSE;

  reg2 BOOLEAN trace = TRUE;

  if (0 == strcmp("alloc_root", state->func))
  {
    trace = FALSE;
  }

  if (0 == strcmp("free_root", state->func))
  {
    trace = FALSE;
  }

  if (0 == strcmp("my_malloc", state->func))
  {
    trace = FALSE;
  }

  if (0 == strcmp("my_free", state->func))
  {
    trace = FALSE;
  }

  if (0 == strcmp("mysql_fetch_row", state->func))
  {
    trace = FALSE;
  }

  if (TRACING && !state->disable_output && state->level <= stack->maxdepth && InList(stack->functions, state->func) &&
      InList(stack->processes, _db_process_))
    trace = TRUE;
  return (trace);
}

/*
 *  FUNCTION
 *
 *	DoProfile    check to see if profiling is current enabled
 *
 *  SYNOPSIS
 *
 *	static BOOLEAN DoProfile ()
 *
 *  DESCRIPTION
 *
 *	Checks to see if profiling is enabled based on whether the
 *	user has specified profiling, the maximum trace depth has
 *	not yet been reached, the current function is selected,
 *	and the current process is selected.  Returns TRUE if
 *	profiling is enabled, FALSE otherwise.
 *
 */

#ifndef THREAD
static BOOLEAN DoProfile()
{
  REGISTER BOOLEAN profile;
  CODE_STATE *state;
  state = code_state();

  profile = FALSE;
  if (PROFILING && !state->disable_output && state->level <= stack->maxdepth &&
      InList(stack->p_functions, state->func) && InList(stack->processes, _db_process_))
    profile = TRUE;
  return (profile);
}
#endif

/*
 *  FUNCTION
 *
 *      _db_strict_keyword_     test keyword for member of keyword list
 *
 *  SYNOPSIS
 *
 *      BOOLEAN _db_strict_keyword_ (keyword)
 *      char *keyword;
 *
 *  DESCRIPTION
 *
 *      Similar to _db_keyword_, but keyword is NOT accepted if keyword list
 *      is empty. Used in DBUG_EXECUTE_IF() - for actions that must not be
 *      executed by default.
 *
 *      Returns TRUE if keyword accepted, FALSE otherwise.
 *
 */

BOOLEAN _db_strict_keyword_(const char *keyword)
{
  if (stack->keywords == NULL)
    return FALSE;
  return _db_keyword_(keyword);
}

/*
 *  FUNCTION
 *
 *	_db_keyword_	test keyword for member of keyword list
 *
 *  SYNOPSIS
 *
 *	BOOLEAN _db_keyword_ (keyword)
 *	char *keyword;
 *
 *  DESCRIPTION
 *
 *	Test a keyword to determine if it is in the currently active
 *	keyword list.  As with the function list, a keyword is accepted
 *	if the list is null, otherwise it must match one of the list
 *	members.  When debugging is not on, no keywords are accepted.
 *	After the maximum trace level is exceeded, no keywords are
 *	accepted (this behavior subject to change).  Additionally,
 *	the current function and process must be accepted based on
 *	their respective lists.
 *
 *	Returns TRUE if keyword accepted, FALSE otherwise.
 *
 */

BOOLEAN _db_keyword_(const char *keyword)
{
  REGISTER BOOLEAN result;
  CODE_STATE *state;

  if (!init_done)
    _db_push_("");
  /* Sasha: pre-my_thread_init() safety */
  if (!(state = code_state()))
    return FALSE;
  result = FALSE;
  if (DEBUGGING && !state->disable_output && state->level <= stack->maxdepth && InList(stack->functions, state->func) &&
      InList(stack->keywords, keyword) && InList(stack->processes, _db_process_))
    result = TRUE;
  return (result);
}

/*
 *  FUNCTION
 *
 *	Indent	  indent a line to the given indentation level
 *
 *  SYNOPSIS
 *
 *	static VOID Indent (indent)
 *	int indent;
 *
 *  DESCRIPTION
 *
 *	Indent a line to the given level.  Note that this is
 *	a simple minded but portable implementation.
 *	There are better ways.
 *
 *	Also, the indent must be scaled by the compile time option
 *	of character positions per nesting level.
 *
 */

static void Indent(int indent)
{
  REGISTER int count;

  indent = max(indent - 1 - stack->sub_level, 0) * INDENT;
  for (count = 0; count < indent; count++)
  {
    if ((count % INDENT) == 0)
      fputc('|', _db_fp_);
    else
      fputc(' ', _db_fp_);
  }
}

/*
 *  FUNCTION
 *
 *	FreeList    free all memory associated with a linked list
 *
 *  SYNOPSIS
 *
 *	static VOID FreeList (linkp)
 *	struct link *linkp;
 *
 *  DESCRIPTION
 *
 *	Given pointer to the head of a linked list, frees all
 *	memory held by the list and the members of the list.
 *
 */

static void FreeList(struct link *linkp)
{
  REGISTER struct link *old;

  while (linkp != NULL)
  {
    old = linkp;
    linkp = linkp->next_link;
    if (old->str != NULL)
    {
      free(old->str);
    }
    free((char *)old);
  }
}

/*
 *  FUNCTION
 *
 *	StrDup	 make a duplicate of a string in new memory
 *
 *  SYNOPSIS
 *
 *	static char *StrDup (my_string)
 *	char *string;
 *
 *  DESCRIPTION
 *
 *	Given pointer to a string, allocates sufficient memory to make
 *	a duplicate copy, and copies the string to the newly allocated
 *	memory.  Failure to allocated sufficient memory is immediately
 *	fatal.
 *
 */

static char *StrDup(const char *str)
{
  reg1 char *new_malloc;
  new_malloc = DbugMalloc((size_t)strlen(str) + 1);
  (void)strcpy(new_malloc, str);
  return (new_malloc);
}

/*
 *  FUNCTION
 *
 *	DoPrefix    print debugger line prefix prior to indentation
 *
 *  SYNOPSIS
 *
 *	static VOID DoPrefix (_line_)
 *	int _line_;
 *
 *  DESCRIPTION
 *
 *	Print prefix common to all debugger output lines, prior to
 *	doing indentation if necessary.  Print such information as
 *	current process name, current source file name and line number,
 *	and current function nesting depth.
 *
 */

static void DoPrefix(uint _line_)
{
  CODE_STATE *state;
  state = code_state();

  state->lineno++;
  if (stack->flags & PID_ON)
  {
#ifdef THREAD
    (void)fprintf(_db_fp_, "%-7s: ", my_thread_name());
#else
    (void)fprintf(_db_fp_, "%5d: ", (int)getpid());
#endif
  }
  if (stack->flags & NUMBER_ON)
  {
    (void)fprintf(_db_fp_, "%5d: ", state->lineno);
  }
  if (stack->flags & PROCESS_ON)
  {
    (void)fprintf(_db_fp_, "%s: ", _db_process_);
  }
  if (stack->flags & FILE_ON)
  {
    (void)fprintf(_db_fp_, "%14s: ", BaseName(state->file));
  }
  if (stack->flags & LINE_ON)
  {
    (void)fprintf(_db_fp_, "%5d: ", _line_);
  }
  if (stack->flags & DEPTH_ON)
  {
    (void)fprintf(_db_fp_, "%4d: ", state->level);
  }
}

/*
 *  FUNCTION
 *
 *	DBUGOpenFile	open new output stream for debugger output
 *
 *  SYNOPSIS
 *
 *	static VOID DBUGOpenFile (name)
 *	char *name;
 *
 *  DESCRIPTION
 *
 *	Given name of a new file (or "-" for stdout) opens the file
 *	and sets the output stream to the new file.
 *
 */

static void DBUGOpenFile(const char *name, int append)
{
  REGISTER FILE *fp;
  REGISTER BOOLEAN newfile;

  if (name != NULL)
  {
    strmov(stack->name, name);
    if (strcmp(name, "-") == 0)
    {
      _db_fp_ = stdout;
      stack->out_file = _db_fp_;
      stack->flags |= FLUSH_ON_WRITE;
    }
    else
    {
      if (!Writable((char *)name))
      {
        (void)fprintf(stderr, ERR_OPEN, _db_process_, name);
        perror("");
        fflush(stderr);
      }
      else
      {
        newfile = !EXISTS(name);
        if (!(fp = fopen(name, append ? "a+" : "w")))
        {
          (void)fprintf(stderr, ERR_OPEN, _db_process_, name);
          perror("");
          fflush(stderr);
        }
        else
        {
          _db_fp_ = fp;
          stack->out_file = fp;
          if (newfile)
          {
            ChangeOwner(name);
          }
        }
      }
    }
  }
}

/*
 *  FUNCTION
 *
 *	OpenProfile    open new output stream for profiler output
 *
 *  SYNOPSIS
 *
 *	static FILE *OpenProfile (name)
 *	char *name;
 *
 *  DESCRIPTION
 *
 *	Given name of a new file, opens the file
 *	and sets the profiler output stream to the new file.
 *
 *	It is currently unclear whether the prefered behavior is
 *	to truncate any existing file, or simply append to it.
 *	The latter behavior would be desirable for collecting
 *	accumulated runtime history over a number of separate
 *	runs.  It might take some changes to the analyzer program
 *	though, and the notes that Binayak sent with the profiling
 *	diffs indicated that append was the normal mode, but this
 *	does not appear to agree with the actual code. I haven't
 *	investigated at this time [fnf; 24-Jul-87].
 */

#ifndef THREAD
static FILE *OpenProfile(const char *name)
{
  REGISTER FILE *fp;
  REGISTER BOOLEAN newfile;

  fp = 0;
  if (!Writable(name))
  {
    (void)fprintf(_db_fp_, ERR_OPEN, _db_process_, name);
    perror("");
    dbug_flush(0);
    (void)Delay(stack->delay);
  }
  else
  {
    newfile = !EXISTS(name);
    if (!(fp = fopen(name, "w")))
    {
      (void)fprintf(_db_fp_, ERR_OPEN, _db_process_, name);
      perror("");
      dbug_flush(0);
    }
    else
    {
      _db_pfp_ = fp;
      stack->prof_file = fp;
      if (newfile)
      {
        ChangeOwner(name);
      }
    }
  }
  return fp;
}
#endif

/*
 *  FUNCTION
 *
 *	CloseFile    close the debug output stream
 *
 *  SYNOPSIS
 *
 *	static VOID CloseFile (fp)
 *	FILE *fp;
 *
 *  DESCRIPTION
 *
 *	Closes the debug output stream unless it is standard output
 *	or standard error.
 *
 */

static void CloseFile(FILE *fp)
{
  if (fp != stderr && fp != stdout)
  {
    if (fclose(fp) == EOF)
    {
      pthread_mutex_lock(&THR_LOCK_dbug);
      (void)fprintf(_db_fp_, ERR_CLOSE, _db_process_);
      perror("");
      dbug_flush(0);
    }
  }
}

/*
 *  FUNCTION
 *
 *	DbugExit    print error message and exit
 *
 *  SYNOPSIS
 *
 *	static VOID DbugExit (why)
 *	char *why;
 *
 *  DESCRIPTION
 *
 *	Prints error message using current process name, the reason for
 *	aborting (typically out of memory), and exits with status 1.
 *	This should probably be changed to use a status code
 *	defined in the user's debugger include file.
 *
 */

static void DbugExit(const char *why)
{
  (void)fprintf(stderr, ERR_ABORT, _db_process_, why);
  (void)fflush(stderr);
  exit(1);
}

/*
 *  FUNCTION
 *
 *	DbugMalloc    allocate memory for debugger runtime support
 *
 *  SYNOPSIS
 *
 *	static long *DbugMalloc (size)
 *	int size;
 *
 *  DESCRIPTION
 *
 *	Allocate more memory for debugger runtime support functions.
 *	Failure to to allocate the requested number of bytes is
 *	immediately fatal to the current process.  This may be
 *	rather unfriendly behavior.  It might be better to simply
 *	print a warning message, freeze the current debugger state,
 *	and continue execution.
 *
 */

static char *DbugMalloc(size_t size)
{
  register char *new_malloc;

  if (!(new_malloc = (char *)malloc((size_t)size)))
    DbugExit("out of memory");
  return (new_malloc);
}

/*
 *		As strtok but two separators in a row are changed to one
 *		separator (to allow directory-paths in dos).
 */

static char *static_strtok(char *s1, pchar separator)
{
  static char *end = NULL;
  reg1 char *rtnval, *cpy;

  rtnval = NULL;
  if (s1 != NULL)
    end = s1;
  if (end != NULL && *end != EOS)
  {
    rtnval = cpy = end;
    do
    {
      if ((*cpy++ = *end++) == separator)
      {
        if (*end != separator)
        {
          cpy--; /* Point at separator */
          break;
        }
        end++; /* Two separators in a row, skip one */
      }
    } while (*end != EOS);
    *cpy = EOS; /* Replace last separator */
  }
  return (rtnval);
}

/*
 *  FUNCTION
 *
 *	BaseName    strip leading pathname components from name
 *
 *  SYNOPSIS
 *
 *	static char *BaseName (pathname)
 *	char *pathname;
 *
 *  DESCRIPTION
 *
 *	Given pointer to a complete pathname, locates the base file
 *	name at the end of the pathname and returns a pointer to
 *	it.
 *
 */

static char *BaseName(const char *pathname)
{
  register const char *base;

  base = strrchr(pathname, FN_LIBCHAR);
  if (base++ == NullS)
    base = pathname;
  return ((char *)base);
}

/*
 *  FUNCTION
 *
 *	Writable    test to see if a pathname is writable/creatable
 *
 *  SYNOPSIS
 *
 *	static BOOLEAN Writable (pathname)
 *	char *pathname;
 *
 *  DESCRIPTION
 *
 *	Because the debugger might be linked in with a program that
 *	runs with the set-uid-bit (suid) set, we have to be careful
 *	about opening a user named file for debug output.  This consists
 *	of checking the file for write access with the real user id,
 *	or checking the directory where the file will be created.
 *
 *	Returns TRUE if the user would normally be allowed write or
 *	create access to the named file.  Returns FALSE otherwise.
 *
 */

#ifndef Writable

static BOOLEAN Writable(char *pathname)
{
  REGISTER BOOLEAN granted;
  REGISTER char *lastslash;

  granted = FALSE;
  if (EXISTS(pathname))
  {
    if (WRITABLE(pathname))
    {
      granted = TRUE;
    }
  }
  else
  {
    lastslash = strrchr(pathname, '/');
    if (lastslash != NULL)
    {
      *lastslash = EOS;
    }
    else
    {
      pathname = ".";
    }
    if (WRITABLE(pathname))
    {
      granted = TRUE;
    }
    if (lastslash != NULL)
    {
      *lastslash = '/';
    }
  }
  return (granted);
}
#endif

/*
 *  FUNCTION
 *
 *	ChangeOwner    change owner to real user for suid programs
 *
 *  SYNOPSIS
 *
 *	static VOID ChangeOwner (pathname)
 *
 *  DESCRIPTION
 *
 *	For unix systems, change the owner of the newly created debug
 *	file to the real owner.  This is strictly for the benefit of
 *	programs that are running with the set-user-id bit set.
 *
 *	Note that at this point, the fact that pathname represents
 *	a newly created file has already been established.  If the
 *	program that the debugger is linked to is not running with
 *	the suid bit set, then this operation is redundant (but
 *	harmless).
 *
 */

#ifndef ChangeOwner
static void ChangeOwner(char *pathname)
{
  if (chown(pathname, getuid(), getgid()) == -1)
  {
    (void)fprintf(stderr, ERR_CHOWN, _db_process_, pathname);
    perror("");
    (void)fflush(stderr);
  }
}
#endif

/*
 *  FUNCTION
 *
 *	_db_setjmp_    save debugger environment
 *
 *  SYNOPSIS
 *
 *	VOID _db_setjmp_ ()
 *
 *  DESCRIPTION
 *
 *	Invoked as part of the user's DBUG_SETJMP macro to save
 *	the debugger environment in parallel with saving the user's
 *	environment.
 *
 */

#ifdef HAVE_LONGJMP

EXPORT void _db_setjmp_()
{
  CODE_STATE *state;
  state = code_state();

  state->jmplevel = state->level;
  state->jmpfunc = state->func;
  state->jmpfile = state->file;
}

/*
 *  FUNCTION
 *
 *	_db_longjmp_	restore previously saved debugger environment
 *
 *  SYNOPSIS
 *
 *	VOID _db_longjmp_ ()
 *
 *  DESCRIPTION
 *
 *	Invoked as part of the user's DBUG_LONGJMP macro to restore
 *	the debugger environment in parallel with restoring the user's
 *	previously saved environment.
 *
 */

EXPORT void _db_longjmp_()
{
  CODE_STATE *state;
  state = code_state();

  state->level = state->jmplevel;
  if (state->jmpfunc)
  {
    state->func = state->jmpfunc;
  }
  if (state->jmpfile)
  {
    state->file = state->jmpfile;
  }
}
#endif

/*
 *  FUNCTION
 *
 *	DelayArg   convert D flag argument to appropriate value
 *
 *  SYNOPSIS
 *
 *	static int DelayArg (value)
 *	int value;
 *
 *  DESCRIPTION
 *
 *	Converts delay argument, given in tenths of a second, to the
 *	appropriate numerical argument used by the system to delay
 *	that that many tenths of a second.  For example, on the
 *	amiga, there is a system call "Delay()" which takes an
 *	argument in ticks (50 per second).  On unix, the sleep
 *	command takes seconds.	Thus a value of "10", for one
 *	second of delay, gets converted to 50 on the amiga, and 1
 *	on unix.  Other systems will need to use a timing loop.
 *
 */

#ifdef AMIGA
#define HZ (50) /* Probably in some header somewhere */
#endif

static int DelayArg(int value)
{
  uint delayarg = 0;

#if (unix || xenix)
  delayarg = value / 10; /* Delay is in seconds for sleep () */
#endif
#ifdef AMIGA
  delayarg = (HZ * value) / 10; /* Delay in ticks for Delay () */
#endif
  return (delayarg);
}

/*
 *	A dummy delay stub for systems that do not support delays.
 *	With a little work, this can be turned into a timing loop.
 */

#if !defined(Delay) && !defined(AMIGA)
static int Delay(int ticks) { return ticks; }
#endif

/*
 *  FUNCTION
 *
 *	perror	  perror simulation for systems that don't have it
 *
 *  SYNOPSIS
 *
 *	static VOID perror (s)
 *	char *s;
 *
 *  DESCRIPTION
 *
 *	Perror produces a message on the standard error stream which
 *	provides more information about the library or system error
 *	just encountered.  The argument string s is printed, followed
 *	by a ':', a blank, and then a message and a newline.
 *
 *	An undocumented feature of the unix perror is that if the string
 *	's' is a null string (NOT a NULL pointer!), then the ':' and
 *	blank are not printed.
 *
 *	This version just complains about an "unknown system error".
 *
 */

#ifndef HAVE_PERROR
static void perror(s) char *s;
{
  if (s && *s != EOS)
  {
    (void)fprintf(stderr, "%s: ", s);
  }
  (void)fprintf(stderr, "<unknown system error>\n");
}
#endif /* HAVE_PERROR */

/* flush dbug-stream, free mutex lock & wait delay */
/* This is because some systems (MSDOS!!) dosn't flush fileheader */
/* and dbug-file isn't readable after a system crash !! */

static void dbug_flush(CODE_STATE *state)
{
#ifndef THREAD
  if (stack->flags & FLUSH_ON_WRITE)
#endif
  {
#if defined(MSDOS) || defined(__WIN__)
    if (_db_fp_ != stdout && _db_fp_ != stderr)
    {
      if (!(freopen(stack->name, "a", _db_fp_)))
      {
        (void)fprintf(stderr, ERR_OPEN, _db_process_, stack->name);
        fflush(stderr);
        _db_fp_ = stdout;
        stack->out_file = _db_fp_;
        stack->flags |= FLUSH_ON_WRITE;
      }
    }
    else
#endif
    {
      (void)fflush(_db_fp_);
      if (stack->delay)
        (void)Delay(stack->delay);
    }
  }
  if (!state || !state->locked)
    pthread_mutex_unlock(&THR_LOCK_dbug);
} /* dbug_flush */

void _db_lock_file()
{
  CODE_STATE *state;
  state = code_state();
  pthread_mutex_lock(&THR_LOCK_dbug);
  state->locked = 1;
}

void _db_unlock_file()
{
  CODE_STATE *state;
  state = code_state();
  state->locked = 0;
  pthread_mutex_unlock(&THR_LOCK_dbug);
}

/*
 * Here we need the definitions of the clock routine.  Add your
 * own for whatever system that you have.
 */

#ifndef THREAD
#if defined(HAVE_GETRUSAGE)

#include <sys/param.h>
#include <sys/resource.h>

/* extern int getrusage(int, struct rusage *); */

/*
 * Returns the user time in milliseconds used by this process so
 * far.
 */

static unsigned long Clock()
{
  struct rusage ru;

  (void)getrusage(RUSAGE_SELF, &ru);
  return ((ru.ru_utime.tv_sec * 1000) + (ru.ru_utime.tv_usec / 1000));
}

#elif defined(MSDOS) || defined(__WIN__) || defined(OS2)

static ulong Clock() { return clock() * (1000 / CLOCKS_PER_SEC); }
#elif defined(amiga)

struct DateStamp
{                 /* Yes, this is a hack, but doing it right */
  long ds_Days;   /* is incredibly ugly without splitting this */
  long ds_Minute; /* off into a separate file */
  long ds_Tick;
};

static int first_clock = TRUE;
static struct DateStamp begin;
static struct DateStamp elapsed;

static unsigned long Clock()
{
  register struct DateStamp *now;
  register unsigned long millisec = 0;
  extern VOID *AllocMem();

  now = (struct DateStamp *)AllocMem((long)sizeof(struct DateStamp), 0L);
  if (now != NULL)
  {
    if (first_clock == TRUE)
    {
      first_clock = FALSE;
      (void)DateStamp(now);
      begin = *now;
    }
    (void)DateStamp(now);
    millisec = 24 * 3600 * (1000 / HZ) * (now->ds_Days - begin.ds_Days);
    millisec += 60 * (1000 / HZ) * (now->ds_Minute - begin.ds_Minute);
    millisec += (1000 / HZ) * (now->ds_Tick - begin.ds_Tick);
    (void)FreeMem(now, (long)sizeof(struct DateStamp));
  }
  return (millisec);
}
#else
static unsigned long Clock() { return (0); }
#endif /* RUSAGE */
#endif /* THREADS */

#ifdef NO_VARARGS

/*
 *	Fake vfprintf for systems that don't support it.  If this
 *	doesn't work, you are probably SOL...
 */

static int vfprintf(stream, format, ap)
FILE *stream;
char *format;
va_list ap;
{
  int rtnval;
  ARGS_DCL;

  ARG0 = va_arg(ap, ARGS_TYPE);
  ARG1 = va_arg(ap, ARGS_TYPE);
  ARG2 = va_arg(ap, ARGS_TYPE);
  ARG3 = va_arg(ap, ARGS_TYPE);
  ARG4 = va_arg(ap, ARGS_TYPE);
  ARG5 = va_arg(ap, ARGS_TYPE);
  ARG6 = va_arg(ap, ARGS_TYPE);
  ARG7 = va_arg(ap, ARGS_TYPE);
  ARG8 = va_arg(ap, ARGS_TYPE);
  ARG9 = va_arg(ap, ARGS_TYPE);
  rtnval = fprintf(stream, format, ARGS_LIST);
  return (rtnval);
}

#endif /* NO_VARARGS */
